Results 81 to 90 of about 120,275 (213)

Optimal Harmonic Measuring Device Placement in Distribution Networks in Consideration of Topology Changes

IEEE Access, 2020
As effective measures of energy savings and emission reduction, non-linear loads, such as variable-frequency drives, are widely used. However, the problem of harmonic pollution in power systems is becoming increasingly severe.
Zhihua Zhang, Zeqi Qu, Jie Yang
doaj   +1 more source

Active Power Filter With Automatic Control Circuit For Neutral Current Harmonic Minimization Technique [QC446.3.H37 I98 2007 f rb]. [PDF]

, 2007
Disertasi ini bertujuan untuk membangun penuras kuasa aktif yang cekap dan boleh dipercayai bagi meminimumkan lebihan harmonik arus neutral dan juga masalah harmonik di dalam talian neutral untuk sistem tiga fasa empat dawai. The aim of this thesis
A Bakar, Mohd Izhar
core  

Note on an Identity of Ramanujan

Mathematics
We extend a summation identity involving the Pochhammer symbol published by Ramanujan in 1915 in the problem section of the “Journal of the Indian Mathematical Society”. Moreover, we offer some applications of our theorem.
Horst Alzer
doaj   +1 more source

Switching on Power Harmonic Filters [PDF]

, 2018
In modern industrial power supply systems, there is observed rapid growth of time varying nonlinear loads having low power factor. The most adequate engineering solution for reactive power compensation of the loads is using compensation units including ...
Yuriy Varetsky
core   +1 more source

Harmonic Series of Convergence Ratio “1/4" with Cubic Central Binomial Coefficients

Axioms
We examine a useful hypergeometric transformation formula by means of the coefficient extraction method. A large class of “binomial/harmonic series” (of convergence ratio “1/4”) containing the cubic central binomial coefficients and harmonic numbers is ...
Chunli Li, Wenchang Chu
doaj   +1 more source

A congruence for some generalized harmonic type sums [PDF]

, 2018
In 1862, Wolstenholme proved that the numerator of the [Formula: see text]th harmonic number is divisible by [Formula: see text] for any prime [Formula: see text]. A variation of this theorem was shown by Alkan and Leudesdorf. Motivated by these results,
Doğa Can Sertbaş, Goral, Haydar, Sertbas, Doga Can, Haydar Göral   +3 more
core   +1 more source

Debunching into a bucket of lower harmonic number [PDF]

, 1987
The adiabatic debunching of beam from buckets of higher harmonic number into waiting buckets of lower harmonic number is a critical step in the current scheme of operation for Tev I. The optimum choice of rf system parameters for this ''bunch coalescing''
MacLachlan, J.A., Griffin, J.E.
core   +1 more source

Remarks on an Identity of Anastase and Díaz-Barrero

Axioms
We extend an algebraic identity of Anastase and Díaz-Barrero (2022) and apply our results to deduce various formulas for sums and series involving (among others) Fibonacci and Lucas numbers, Bernoulli polynomials, and the Riemann zeta function.
Horst Alzer, Robert Frontczak
doaj   +1 more source

Harmonic mappings between surfaces : some local and global properties [PDF]

We develop some local and global properties of a harmonic map f :M -> N between surfaces. Our first main result is a local description of the possible singularities of such a harmonic map - we find there are four types: degeneracy, general fold ...
Wood, John C.
core  

The number of harmonic frames of prime order [PDF]

, 2010
Harmonic frames of prime order are investigated. The primary focus is the enumeration of inequivalent harmonic frames, with the exact number given by a recursive formula.
Hirn, Matthew
core   +1 more source